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Audi V8 Quattro Engine Cooling Fan Motor Relays

Audi V8 Quattro Engine cooling fan motor relays

Starting at $35.95, AutoBuffy stocks 2 engine cooling fan motor relays from Standard Ignition and VEMO for the Audi V8 Quattro. This relay is an electrical switch that sends power to the electric cooling fan motor when the engine reaches operating temperature. A failed relay means the fan won't run, leading to overheating and potential engine damage.

Signs your Audi V8 Quattro needs a new engine cooling fan motor relay

  • Engine temperature gauge climbs into the red zone at idle or in slow traffic, but returns to normal at highway speeds where airflow cools the radiator naturally
  • Cooling fan never turns on — even when the engine is fully warmed up or the A/C is switched on
  • Cooling fan runs continuously at full speed from the moment the engine starts and never shuts off, indicating the relay is stuck closed
  • A/C output turns warm or weak at idle because the condenser fan, controlled by the same relay circuit, is not running
  • You can hear or feel the relay clicking when commanded but the fan still doesn't spin, pointing to an internal contact failure
  • You find a blown fuse in the cooling fan circuit — a shorted or damaged relay can cause repeated fuse failures in the same slot

Which engine cooling fan motor relay should you buy for your Audi V8 Quattro?

The main decision is whether to buy an OE-equivalent relay, an upgraded heavy-duty unit, or a relay with an integrated socket harness. Confirm whether your Audi V8 Quattro uses a single relay for the fan or separate high-speed and low-speed relays, as ordering the wrong one is the most common mistake. Matching the relay's amperage rating and terminal configuration to the factory specification is essential for reliable operation.

OE-Equivalent Relay
Best for
Owners who want a direct drop-in replacement at a budget-friendly price
What you get
Matches original amperage, terminal layout, and mounting footprint; plug-and-play installation with no modifications
Heavy-Duty / High-Amp Relay
Best for
Vehicles with upgraded electric fans or engines that run hot in demanding conditions
What you get
Reinforced contacts rated for higher continuous current draw, reducing heat buildup and extending service life over stock units
Low-Speed Fan Relay
Best for
Vehicles with a two-speed cooling fan system needing only the low-speed circuit repaired
What you get
Controls the fan's first stage that activates at normal operating temperature or when A/C is on; does not affect high-speed operation
High-Speed Fan Relay
Best for
Vehicles with a two-speed system where the fan fails to reach full speed during heavy load or near-overheat conditions
What you get
Controls the second stage that kicks in at elevated coolant temps; required for adequate cooling during towing, idling, or hot climates

Engine cooling fan motor relays brands we stock for your Audi V8 Quattro

Standard Ignition
1 option · from $35.95
VEMO
1 option · from $35.95

Replacing the engine cooling fan motor relay on a Audi V8 Quattro

Easy⏱ 15–30 minutesRelay puller or small flathead screwdriverMultimeter or 12V test lightOwner's manual or underhood fuse box diagramNeedle-nose pliers (for stubborn relay sockets)

Open the underhood fuse and relay box, locate the cooling fan relay using the fuse box cover diagram or owner's manual, and pull the old relay straight out — no wiring disconnection is needed in most cases. Press the new relay firmly into the same socket until it seats, then start the engine and verify the fan activates at operating temperature or when the A/C is switched on. If the relay box is corroded or the socket terminals are burned, clean them with electrical contact cleaner before installing the new part.

Frequently asked questions

How much does it cost to replace engine cooling fan motor relays on a Audi V8 Quattro?
Parts start at $35.95 for the relay itself on a Audi V8 Quattro. Because the relay is typically located in the underhood fuse and relay box, labor is minimal — most shops charge less than one hour. DIY replacement is straightforward and can cut total cost significantly compared to a dealership visit.
Can I drive my Audi V8 Quattro with a bad cooling fan motor relay?
You should not drive a Audi V8 Quattro with a failed cooling fan relay beyond what is absolutely necessary. Without the electric fan running at idle or low speeds, the engine can overheat within minutes in traffic or hot weather. Sustained overheating risks warped cylinder heads, a blown head gasket, or catastrophic engine damage.
How do I test the engine cooling fan motor relay on my Audi V8 Quattro?
Swap the suspect relay with an identical relay from another position in the fuse box — many vehicles use the same part number for multiple relays. You can also apply 12 volts directly to the relay's coil terminals; a functioning relay will click and show continuity across the switch terminals. A multimeter or basic test light is all you need.
How long does a cooling fan motor relay last on a Audi V8 Quattro?
Relays are solid-state switches with no moving parts beyond internal contacts, so they can last the life of the vehicle. In practice, heat cycling under the hood, voltage spikes, and high current draw degrade the contacts over time. Relays in vehicles frequently used in high-heat conditions or with aftermarket fans tend to wear sooner.
Will a bad cooling fan relay cause my Audi V8 Quattro's A/C to stop working?
Yes, on most Audi V8 Quattro configurations the condenser fan and radiator cooling fan share the same relay or a relay in the same control circuit. If the relay fails, neither fan runs, and without airflow across the A/C condenser the refrigerant cannot release heat properly. This causes high-side pressure to spike and the A/C system to underperform or cut out entirely.
Is the cooling fan motor relay the same as the cooling fan resistor on a Audi V8 Quattro?
No — these are two separate components. The relay is an on/off (or high/low speed) electrical switch that routes battery voltage to the fan motor. The resistor, used on some two-speed systems, limits current to achieve low-speed operation. A failing resistor causes loss of low-speed fan function only, while a failed relay typically kills the fan entirely.

Shop engine cooling fan motor relays by year for the Audi V8 Quattro

19941993199219911990

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